Jet aircraft



FIG. 1 is a side view of a jet aircraft illustrating our new design;

FIG. 2 is a top view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a back face view thereof;

FIG. 6 is a right side perspective view thereof; and,

FIG. 7 is a left rear perspective view thereof. 

The ornamental design for a jet aircraft, as shown and described. 